The tension control system is the core of the gravure printing machine. The control system works steadily, the tension change is small, and the machine's overprint accuracy and printing speed are high.
When printing on the web, a certain tension is required to tension the web into the printing unit to ensure accurate overprinting. There are many ways to generate tension, and no matter what kind of method, the web can not be pulled freely, because under the condition of free cutting, the tension will increase when the printing machine accelerates, and the inertia of the web will cause The tension becomes smaller, resulting in a change in tension, which is undesirable. If the tension is too small, the insufficient power of the coil will cause accumulation and wrinkling, and normal printing cannot be performed; if the tension is too large, the coil will be deformed or even broken.
Factors affecting changes in tension
1. The defects of the coil itself such as uneven thickness and eccentricity;
2. The friction between the coil and the guide rollers is different;
3. The diameter change of unwinding and rewinding;
4. Different manufacturing precision and assembly precision of each component of the machine;
5. Material receiving and material cutting without stopping the machine;
6. Changes in temperature and humidity in the production environment.
Types and functions of tension control system
Type: The tension zone of the gravure printing machine can be divided into 3 parts: tension in the unwind zone, tension in the printing zone, and tension in the rewind zone. The tension in the unwinding zone refers to the tension between the unwinding shaft and the paper feed roller before entering the first printing unit; the tension in the printing zone refers to the tension between the paper feeding roller after entering the first printing unit and the last color printing unit. The printing tension between the units; the tension in the take-up area refers to the tension between the rewinding shaft of the paper roll of the last color printing unit and the paper roll.
Function: The role of the tension control system in the gravure printing machine is to control the speed of the unwinding shaft of the web, the speed of the winding shaft, and the speed of the individual tension rollers between the printing mechanisms according to the change of the tension in each zone, eliminating the unwinding mechanism to the winding mechanism The fluctuation of tension adjusts the movement speed of the coil to achieve the purpose of tension adjustment.
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